Sharp MX5500n powering off

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  • David Scott
    • Jun 2025
    #1

    Sharp MX5500n powering off

    Weird problem I am having with this sharp mx 5500n. I returned to this machine with the idea of a simple fix of replacing a control panel.(Did not get that far) Now I have a dead machine and only when I unplug and plug back in the pwr supply powers up and after 10 seconds it shuts down. Repeatedly does this. I have check voltage in wall outlet and i am getting 120volts and same reading out of pwr supply until it shuts down. No lights on control panel light up the entire time.

    I have done a shotgun approach with a parts machine i had so basically switched out all boards in machine. I thought it might have been that i was troubleshooting with back off machine but i have found no door switches anywhere that would prevent machine powering up and also placed covers back on to re assure this. 22 years of service this one has me stumped! Small one man operation here and would love some advise! Thanks!!!
    Tags: None
    • rainmaker
      Technician

      50+ Posts
      • Jul 2011
      • 77
      #2
      Re: Sharp MX5500n powering off

      does the copier have a network cable plugged into the copier?if it does try to shut the copier off and unplugged the cable from the copier..i have seen this happen where it would shut off and on...good luck

        Comment

        • David Scott
          #3
          Re: Sharp MX5500n powering off

          Originally posted by rainmaker
          does the copier have a network cable plugged into the copier?if it does try to shut the copier off and unplugged the cable from the copier..i have seen this happen where it would shut off and on...good luck

          No the network cable is not attached. thanks

            Comment

            • blackcat4866
              Master Of The Obvious

              Site Contributor
              10,000+ Posts
              • Jul 2007
              • 22997
              #4
              Re: Sharp MX5500n powering off

              Have you tried swapping fusers? On older Canons, an open fuser lamp or exposure lamp shuts the main switch Off after ~5 seconds. =^..^=
              If you'd like a serious answer to your request:
              1) demonstrate that you've read the manual
              2) demonstrate that you made some attempt to fix it.
              3) if you're going to ask about jams include the jam code.
              4) if you're going to ask about an error code include the error code.
              5) You are the person onsite. Only you can make observations.

              blackcat: Master Of The Obvious =^..^=

                Comment

                • David Scott
                  #5
                  Re: Sharp MX5500n powering off

                  Originally posted by blackcat4866
                  Have you tried swapping fusers? On older Canons, an open fuser lamp or exposure lamp shuts the main switch Off after ~5 seconds. =^..^=
                  Yea i tried fuser from my parts machine and tested continuity with meter on lamp (good) thanks

                    Comment

                    • rainmaker
                      Technician

                      50+ Posts
                      • Jul 2011
                      • 77
                      #6
                      Re: Sharp MX5500n powering off

                      what does it do if you leave the front door open and turn the copier on ? does it still turn off? did it just start doing it by itself,meaning it has been working fine with out anybody doing service on it?

                        Comment

                        • JustManuals
                          Field Supervisor

                          5,000+ Posts
                          • Jan 2006
                          • 9838
                          #7
                          Re: Sharp MX5500n powering off

                          This Parts & Service Manual can now be purchased for $12.77 and downloaded immediately after payment from


                          Just Manuals, The Internet's largest selection of manuals ~ Instant Downloads


                          Paul@justmanuals.com

                            Comment

                            • Akitu
                              Legendary Frost Spec Tech

                              Site Contributor
                              2,500+ Posts
                              • Oct 2010
                              • 2595
                              #8
                              Re: Sharp MX5500n powering off

                              You said you changed boards, but did you replace the ROM chips with the ones from the new boards or re-use the original ROM chips? I had a similar issue when my PRGM2 BOOT ROM chip got corroded in a monochrome machine.
                              Cthulhu for president! Why settle for the lesser evil?

                                Comment

                                • mojorolla
                                  The Wolf

                                  2,500+ Posts
                                  • Jan 2010
                                  • 2583
                                  #9
                                  Re: Sharp MX5500n powering off

                                  Does it have a Fiery on it?


                                  Failing to plan is planning to fail!!!

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